import type { PropOptionsGenerator } from '../types';
import type { Validator } from '../validators';
/**
 * Allows any type. No built-in runtime validation is performed by default.
 *
 * @template T - can be used to restrict the type at compile time.
 * @param validator - Optional function for runtime validation; should return `undefined` if valid, or an error string if invalid.
 */
export declare const anyProp: <T = any>(validator?: Validator) => PropOptionsGenerator<T>;